preparation of diethyl 2-3-iodo-phenylamino methylene malonate 3-iodo-aniline 3 3 5 ml 41.6 mmol and diethyl ethoxymethylenemalonate 9.4 ml 45.7 mmol were stirred at 110 องศา overnight the reaction mixture was cooled hexane was added and the precipitate was collected by filtration to give diethyl 2-3-iodo-phenylamino methylene malonate 4 as white solid